Audi Repair Questions? Ask a Mechanic for Answers ASAP
Judging by the fault, and the rough idle, I would say you have an intake air leak, not a bad sensor of any kind. What scan tool are you using?
You replaced the PCV on the front of the valve cover, correct? And if you try to remove the oil cap while the engine is running, you can remove it OK, it doesn't suck down tight and unable to move?
The intake flap should not affect the lean reading, no matter what position the flap is in, unless there is actually damage that results in an intake air leak. Have you checked the adaptation values for idle and of idle? If it is over 7% at idle (and especially if it is in the high teens) then you need a new MAF
correct, the fuel trims, MVB 32.
I noted you said that it idles rough on cold start- does it clear out after a little while? It may be that you are having an issue with carbon fouling on the intake valves. This is pretty common, and then when you cold start all the fuel gets absorbed by this carbon so it runs lean until it can get fueled correctly. If you have a borescope with a 90 degree view you can look down the spark plug holes, or if you have a straight borescope you can take the manifold pressure sensor out and go straight down one of the runners. otherwise you would have to remove the intake (which you would have to do to clean these anyway)
ok, from those readings I would not suspect a MAF, or an intake air leak, or it would be adjusting like crazy to account for extra air.
did you ever get around to replacing the intake, if it is actually damaged? Or can you hear air sucking or whistling around the intake area with the engine running? I would expect with fuel calculations like that after a while, you either have a leak that you should be able to hear, or you have a bad MAF.